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(No Model.)

V. B. HUBBELL. PROCESS 0F GUNSTRUGTING POOL BALLS. No. 522,791.

Patented July l0, 1894.

RED

mc'nomus versus co.. novo-Lnuo., wnsmnson. n. c.-

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UNITED STATES PATENT OFFICE.

VINCENT B. HUBBELL, OF NEW YORK, N. Y.

PROCESS OF CONSTRUCTING POOL-BALLS.

SPECIFICATION forming part of Letters Patent No. 522,791, dated July 10,1894.

Application lecl March 28, 1894. Serial No. 505,373. (No specimens.)

To @ZZ whom z5 may concern:

I 3e it known that I, VINcENr B. HUBBELL, a c1t1zenof the United States,residing at New York,.1n the county of New York and State of New York,have made a new and useful Improvement in Processes of ConstructingPool- Balls, of which the following is a specification.

My invention relates especially to improvements 1n pool balls made ofplastic material, such as celluloid, and prepared by subjecting suchmaterial to high pressure, and its object 1s to effect in as simple amanner as possible the manufacture of such balls when constructed ofdierent colored materials.

My invention will be fullyr understood by referring to the accompanyingdrawings, in which-- Figure 1 illustrates partly in section and partlyin elevation my improved mold, together with the material in positionfor constructingthe central or usual red-colored seg-` ment of the ball.Fig. 2 illustrates a similar sectional view through the mold and acompleted ball in place therein. Fig. 3 illustrates 1n plan view thatportion of the ball which is shown as in the process of construction inFig. 4 is a vertical sectional view taken through Fig. 3, and Fig. 5 isa similar vertical sectional view of the same portion of the ball afterits lateral faces and interior edges have been dressed or turned in alathe. Fig. 6 illustrates my improved pool ball as it appears afterremoval from the mold shown 1n Flg. 2. Fig. 7 illustrates in sectionalview a completed pool ball showing the colored por tions thereof.

Referring now tothe drawings in detail: A represents a mold usually ofcast steel and of cylindrical form; B and O are movable parts fittingtherein, the former being prov1ded with an opening E adapted to receivea neck or extension D which is integral with the upper surface of thelatter, these portions being adapted to form the first or centralsegment of the ball. The plastic material R for this central segment iscolored preferably red and is placed in the mold A after which themovable portions B and C are inserted and the Whole subjected to a highdegree of heat and hydraulic or other pressure, as well understood bythose skilled in the art, until the segment is compressed to the desireddensity.

The parts B and C, together with the segment R, are then re1noved,saidsegment assuming the structure shown in Figs. 3 and 4 with a centralopenin g H. It is then placed in a lathe and its opposite faces h turnedto the required parallelism and the inner edges rounded ott' in themanner shown in Fig. 5. This segment is now placed again in the mold Aiu the position shown in Fig. 2 and the additional plastic material W,preferably white material, carefully packed in position in the moldafter which the semi-spherical movable parts F and G are inserted, andthese parts together with the material again subjected to heat andhydraulic or equivalent pressure as before, thus causing the materialsto assume the rrelative conditions shown -at W andN in Fig. 2. Thepressure is now removed, the parts F and G disconnected and the ballejected, it appearing as shown-in Fig. 6. It is then placed in a turninglathe and reduced to the required size and spherical condition afterwhich it is sand-papered and polished in the usual manner, the completed-ball appearing as shown in cross section in Fig. 7, the central segmentbeing red and the end segments being white, said white segments beingunited together in one integral piece by the shank N and to the centralsegment as shown in Figs. 2 and 7.

I am aware that pool balls having dierent colored segments haveheretofore been constructed by compression by subjecting the centralsegment to pressure in a mold and afterward turning dove tailedextensions upon the lateral faces thereof, finally cornpressing thewhite segments around these dove-tailed extensions, as disclosedinpatent to Burt No. 507,880, granted October 3l, 1893, and also that apool ball has heretofore been constructed of plastic material having acolored central segment with a hole through the centralportion thereofand oppositely disposed end segments which are held together by a pinextending through the central or colored segment and the whole ballafterward subjected to pressure as disclosed in patent to Burt No.513,876, granted January 30, 1894, and I make no claim to any subjectmatter shown or described in either of the patents above referred to. lbelieve it is broadly new with me, however, to construct apool ball IOOzeA

having segments of different color by rst subjecting the plasticmaterial, which forms one of the segments, to pressure andsimultaneously removing a central core therefrom so as to leave anopening therethrough, and t0 then subject this central segment andadditional plastic material of a different' color to a secondcompression, whereby the two parts are united together in one integralmass substantially as shown in Figs. 2 and 7 of the drawings.

I believe I am the tirst to construct a pool ball of diierent coloredplastic materials of two parts only, the one extending through the otherwhereby they are united in one integral mass, and my claims are genericin this particular. Nor do I Iimit myself to the construction of a poolball having segments of two colors only, as it is obvious that in thecarrying out of the process hereinbefore described, I may makeseveralindependent segments like those shown in Figs. 3, 4 and 5 eitherof the same or of different colored materials and then place them in amold as in Fig. 2 with substantially equal quantities of uncompressedplastic material of the same nature but of different color, as whitebetween them, and then subject the whole mass to heat and pressure asbefore after which the ball may be turned and dressed to its true forminthe manner already described.

Having thus described my invention, what I claim, and desire to secureby Letters Patent ot' the United States, is-

1. The described process of constructing a pool ball which consists incompressing a central segment and simultaneously removing a central coretherefrom and finally compressing the material which forms the adjacentside segments through this central opening and causing said parts to befirmly united together.

2. The described process of constructing a pool ball which consists infirst forming a central segment lwith an opening therethrough, and thencompressing additional material through this opening and causing theparts to be integrally united together.

Y3. The described process of forming a pool ball having segments ofdifferent color which consists in first compressing one segment andsimultaneously forming an opening therethrough and then forming theother segments by subjecting material of different color to additionalpressure against the lateral faces of the first segment and through thecentral portion thereof.

In testimony whereot` I have hereunto subscribed my name this 26th dayof March, 1894.

VINCENT I3. I-IUBBELL.

Witnesses:

CHARLES J. KINTNER, M. M. ROBINSON.

